Possibly the most inept parents EVER. I suppose when the Doctor first had children he was still on Gallifrey and had servants or something to remind him about his kids. Oh dear.

"Well...I...they're somewhere to put my hands. To keep them warm. And stop them touching things."

You grabby, oral-fixated fetishist, you.

And, oh, they're so Ten and Romana in this. Yaaaaaay! The dialogue is especially smashing.